Lifting-jack.



No. 660,507. Patented 0st. 23, |900.

. J. T. HARBIN.

LIFTING JACK.

(Application mea Feb. 27, mooi) (Nu Model.) v 2 Sheets-Sheet l.

w/TNESSES'.- /N VEA/Tof? Patented Oct. 23, |900.

J. T. HARBIN.

LIFTING JACK.

(Application med Feb. 27, 1900.)

2 Sheets-Sheet 2.

(No Model.)

/N VENTOH v WITNESS/: S

W on M m 7m .of wf M d UNITED STATES PATENT OFFICE.

JOSEPH THOMAS HARBIN, OF CONDONfOREGON.

LIFTING-JACK.

SPECIFICATION forming part of Letters :Patent No. 660,507, dated October23, 1900.

Application filed February 27, 1900. Serial No. 6,744. dio model.)

To @ZZ whom, t Ina/y concern:

Be it known that I, JOSEPH THOMAS HAR- BIN, residing at Condon, in thecounty of Gilliam and State of Oregon, have invented a new and ImprovedLifting-Jack, of which the following is a specification.

This invention relates to that class of mechanical appliances termedlifting-jacks, and primarily seeks to provide an appliance of suchcharacter embodying a very simple, compact, and powerful construction ofeasy adjustment and manipulation and adapted for lifting heavy loads,for use as an ordinary wagon-jack, for mining, logging, or blacksmithpurposes, for holding drills in position, for handling heavy rocks orloads, and for lifting railroad-rails or other heavy articles close tothe ground, the same being also adapted for truck, dray, andhouse-moving pur poses.

Generally my invention comprehends a construction including acombination of screw and lever operated devices so arranged that theelevating shank or member can be quickly moved up by lever-operatedmeans or slowly and more powerfully elevated by screw action and inwhich the screw and lever devices are arranged to act interchangeablyt'.e., the screw forming the ratchet-surfaces for the lever-pawls and thelever-pawls forming, as it were, xed male-thread members with which thescrew-surfaces engage when the jack is Operated by screw action.

In its more specific nature my invention embodies a suitable hollowsupport or standard, a lifting-bar movable vertically within thestandard, said bar having an external spiral groove or threadway, and alever held to straddle the standard provided with a pair of opposing andalternately-operating pawls held to engage the spiral groove in thelifting-bar, said specific construction also including a pair ofsupplemental pawls mounted upon the standard, that engage the spiralgroove in the lifting-bar and which serve principally as a means forsupporting the bar in its elevated position and to relieve thelever-pawls of the weight of the said bar and its load.

In its other and more subordinate features my invention consists incertain details of construction and novel combination of parts,

l all of which will be first described and then pointed out in theappended claims, reference being had to the accompanying drawings, inWhich- Figure 1 is a perspective view of my improved screw and leverOperated lifting-jack Fig. 2 is a vertical section of the same, thelifting-bar being Shown partly elevated. Fig. 3 is a side elevationshowing the supportingsrandard as a tripod, the jack in this arrangementbeing adapted to lift heavy loads from the ground. Fig. 4 is ahorizontal section taken on the line 4 4 of Fig. 2. Fig. 5 is a detailview of the lifting-rod;l and Fig. 6 is a detail view illustrating thelever with the detachable member 9 forming a part thereof.

Referring to the accompanying drawings, in which like numerals indicatelike parts in all the figures, l denotes the hollow standard or support,which when the appliance is arranged as an ordinary lifting-'jack has afoot or base l, and at the lower end the said standard has avertically-extended slot lc. At one side and just above its central orswelled portion lb said standard has a pair of oppositelydisposed slotsld, the purpose of which will presently appear. A lifting bar 2 is heldwithin the standard Al, and the said bar in practice is made of a lengthat least that of the height of the standard, so that its lower end 2when the said bar is dropped `to its lowermost position will lie nearthe bottom of the base of the standard, whereby to bring a foot member3, secured to the said bar 2, low enough to be projected under heavyobjects upon the floor or ground, said foot 3 projecting through andworking in aslot l, as shown. The extreme lower end of the lifting-bar 2has an apertured projection 2b, and when the base or support is in thenature of a tripod, as shown in Fig. 3, said projection 2b provides forreadily connecting a chain or hook with the lifting-bar when it isdesired to dish a wheel or lift a rock or other heavy load. The upperend of the bar 2 has an annular enlargement or head 2c, formed with oneor more radially-extending sockets 2d, adapted to receive a lever-rodwhen the lifting-bar is to be elevated by the screw action, hereinafterexplained.

' 4 indicates a cap loosely mounted upon the top of the lifting-rod,which may have such shape and impact surface as the conditions underwhich the appliance is to be used may make desirable.

The bar 2 has an external spiral groove or screw a5, extending from itslower end upward nearly its entire length.

At a point about midway its height the standard 1 has a swelled portion1b and brackets 1e, between which and the standard proper the straddleportions 6a of the lever 6 rest, said portions 6 being held to rock uponthe stub-screw bearings 7, that project through the brackets 1e andenter sockets in the standard, as clearly shown in Fig. 4. In itssimplest form the lever has its handle portion 6c projectedto one sideonly, its opposite end, however, terminating in a blunt portion 6d,which is so formed that a cuff member 8 may be readily slipped thereonto form a socket to receive the detachable leverhandle 9, which undercertain emergencies can be made fast to the lever-body proper, wherebyto permit of two persons operating the lever from opposite sides, whendesired.

10 10 designate ratchet-pawls carried by the lever 6 and disposed oneupon each side of the standard, said pawls being so mounted upon thelever that their upper ends will normally drop through the slots 1c inthe standard, such inward pressure of the pawls being made possible bysuitable springs 11, held within sockets formed in the lever 6 and tobear against heel portions of the pawl, as best shown in Fig. 2, byreference to which it will also be seen the upper or penetrating ends ofthe pawls are inclined or beveled on opposite angles, whereby the saidends will positively engage with the screw-groove or threadway 5 of thelifting-bar 2.

So far as described the manner in which my improvement operates is asfollows: Assuming the parts to be in the position shown in Fig. 2, thelifting-bar supported in its elevated position by the pawls 10 10, thesame forming, as it were, stop-clutches when in the position shown, nowby pressing the lever 6 down the outer pawl (meaning .the one at theleft of Fig. 2) acts as a supporting and lifting clutch,while the otherpawl slides freely downward over the face of the bar 2 until it dropsinto engagement With the next or lower ratchet-surface, it beingunderstood that as the bar 2 is not rotated when lifted by lever actionthe diametrically-opposite faces of the groove a5 form, as it were, apair of clearly-defined vertical ratchet-surfaces.

To provide for a quick drop of the bar 2, a band 12, adapted to be slidover the upper end of the standard, is employed, which rests upon theswelled part of the standard and under the clutch-pawls 10 10. Byraising the band 12 both vpawls will be quickly freed from engagementwith the bar 2 and the said bar thereby permitted to move freely withinthe standard. When it is desired to elevate the bar 2 by screw action,it is only necessary to insert a lever-rod into any one ofthe sockets inthe bar-head and rotate the bar to the right, the clutch-pawls 10 10during this operation acting as stationary thread-engaging members.

13 13 indicate a pair of supplemental pawls pivotally secured in theupper end of the standard and held to drop with their nose endsinengagement with the groove or thread`- way a5 in the bar 2, said pawlsbeing held to their engaging position by gravity or by spring, or both.l

From the foregoing, taken in connection with the accom panying drawings,it is thought the advantages of my invention will readily appear.

When used as an ordinary jack, the bar can be elevated quickly by leveraction, and when necessary to raise it slowly and with a powerful actionit can be lifted by screw operation. The several partsare so arrangedthat the appliance can be readily adapted to the various uses beforereferred to, for each of which uses it will quickly, conveniently, andeffectively operate.

Having thus described myinvention, what I claim, and desire to secure byLetters Patent, is-

1. Aliftingjack,comprisingahollowstandard; a lift-bar vertically androtatably movable within the standard, said bar having a spiral grooveor threadway, and a lever mech-v anism, including a pair of clutch-pawlsadapted to engage with the spiral groove and at opposite sides of thelifting-bar, as described.

2. A lifting-jack, comprisingastandard; a lifting-'bar rotatably andvertically movable within the standard; means for quickly elevating thestandard, and clutch-pawls engaging the standard for holding it to itselevated position, said standard having an external spiral grooveengaging the pawls and operatively connected therewith, whereby when thesaid lifting-bar is rotated it will move Vertically as specified.

3. In a lifting-jack, the combination with the standard; the lifting-barvertically movable therein, said bar having vertical racksurfaces onopposite sides; a lever straddling the standard; a pair of pawls carriedby the lever, said Vpawls being arranged to engage the rack-surfaces ofthe lifting-baron the opposite sides; means for normally holding thepawls'in engagement with the said surfaces, and a member verticallymovable upon the standard for engaging with and shifting the pawls to aninoperative position as specied.

4t. The combination with the hollow standard having vertical slotsdisposed diametrically opposite each other; the lifting-bar movable inthe standard, said bar having an eX- ternal spiral groove or threadway;a lever pivoted upon the standard below its slots to swing in a verticalplane; a pair of clutchpawls secured on such lever, one at each side ofthe standard, said pawls projecting through the coincident slots of thestandard to engage with the lift-bar, said pawls being also oper- IOCIIO

IZO

atively arranged to alternate as a stop member and as a lift-pawl; andsupplemental pawls supported on the standard and normally moved inposition to engage the liftbar at a point above the standard and serveas stop-pawls, as specified.

5. Alii'tingjack,comprisingahollowstandard having a vertical slot at oneside near its bottom, and a pair of slots in its upper end, the upperslots being diametrically opposite each other; a lifting-bar having anexternal spiral groove and having at its upper end a head-piece formedwith radial sockets; a laterally-'projecting lift member securedvto thelower end of the bar and projected through the bottom slot of thestandard; and a lever horizontally pivoted to the standard to rock in avertical plane, said lever having a portion straddling the standard; thepaWls and the springs for operating them carried upon JOSEPH THOMASHARBIN;

Witnesses: l y

SAM E. VAN VAoToR, FRED DONALDSON.

